drivers/md/dm-raid45.h

   1 /*
   2  * Copyright (C) 2006-2009 Red Hat, Inc. All rights reserved.
   3  *
   4  * Module Author: Heinz Mauelshagen (Mauelshagen@RedHat.com)
   5  *
   6  * Locking definitions for the device-mapper RAID45 target.
   7  *
   8  * This file is released under the GPL.
   9  *
  10  */
  11
  12 #ifndef _DM_RAID45_H
  13 #define _DM_RAID45_H
  14
  15 /* Factor out to dm.h! */
  16 #define STR_LEN(ptr, str)       (ptr), (str), strlen((ptr))
  17 /* Reference to array end. */
  18 #define ARRAY_END(a)    ((a) + ARRAY_SIZE(a))
  19
  20 enum dm_lock_type { DM_RAID45_EX, DM_RAID45_SHARED };
  21
  22 struct dm_raid45_locking_type {
  23         /* Request a lock on a stripe. */
  24         void* (*lock)(sector_t key, enum dm_lock_type type);
  25
  26         /* Release a lock on a stripe. */
  27         void (*unlock)(void *lock_handle);
  28 };
  29
  30 #endif